03-06-2015
Mathematics

contestada

−4x + y = 6
−5x − y = 21

Respuesta :

apologiabiology apologiabiology

03-06-2015

assuming x=x and y=y in both equations
add them together

-4x+y=6
-5x-y=21 +
-9x+0y=27
-9x=27
divide by 9
-x=3
multiply -1
x=-3

subsiutte
-4x+y=6
-4(-3)+y=6
12+y=6
subtract 12
y=-6

x=-3
y=-6
the soultion set is in (x,y) form
(-3,-6)

Answer Link

Otras preguntas

Which of the following is correct? David, be sure to mind your ps and qs. David, be sure to mind your p's and q's. both

why is the a shell considered to be biotic

Three times two less than a number is greater than or equal to five times the number. Find all of the numbers that satisfy the given conditions. Let n= a number

Why doesn't NiC2O4 precipitate with CaC2O4?

What were key factors in creating a strong wartime economy?Select one of the options below as your answer: A. new technologies, new methodologies, full labor fo

Or like, Papi, two swimmers looking down at the quiet surface of our island waters, seeing their faces right before plunging in, eager, afraid, not yet sure of

Round to the given place value position 265,409

A heartbeat take 0.8 second how many seconds is this written as a fraction

How many significant figures will there be in the answer to the following problem? You do not have to solve the problem. 6.783 - 2.56 = How many significant f

Which are partial products for 57 × 48? Choose all answers that are correct. A. 5 x8 = 40 B. 7 x 8 = 56 C. 7 x 40 = 280 D. 50 x 4 = 200